BUG #6688: can't install from binary.

The following bug has been logged on the website:

Bug reference: 6688
Logged by: Rob
Email address: omnis(at)ra1(dot)net
PostgreSQL version: 9.1.4
Operating system: OSX 10.4.11
Description:

Hi,

I get an error when trying to run the 9.1.4 installer binary
(postgresql-9.1.4-1-osx.app) on my Mac PowerBook PPC running OS X 10.4.11.

It says, "Bad CPU type in executable."

Your download page says that OS X 10.4 on PPC is supported -- "A one click
installer is available for for Mac OS X 10.4 and above on Intel and PPC and
includes PostgreSQL, pgAdmin, PL/Java and the PL/pgSQL debugger plugin.'
http://www.postgresql.org/download/macosx/

What am I missing? Or what might I be doing wrong? I simply downloaded the
disk image and tried to run the installer.

Thanks a lot.
Rob